One day, the master picked up a demon and fell into a cycle of having to retreat as soon as he came out of seclusion.
As a senior brother, he had no choice but to lead his junior brother, who was possessed of demonic aura, on the long road of feeding demons...
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PS:
Tu Su
The background has been changed, maybe a lot, so don't use the background in Ancient Sword to speculate on the author's brilliant mind.